Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458
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Open Access
- 14 April 2003
- journal article
- Published by EDP Sciences in Astronomy & Astrophysics
- Vol. 402 (2), 701-712
- https://doi.org/10.1051/0004-6361:20030252
Abstract
We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also present evolutionary models for irradiated planets, coupling for the first time irradiated atmosphere profiles and inner structures. We focus on HD 209458-like systems and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets. Irradiation effects, however, cannot alone explain the large observed radius of HD 209458b. Adopting assumptions which optimise irradiation effects and taking into account the extension of the outer atmospheric layers, we still find $\sim$ 20% discrepancy between observed and theoretical radii. An extra source of energy seems to be required to explain the observed value of the first transit planet.Comment: 14 pages, Latex file, uses aa.cls, accepted for publication in A&
Keywords
This publication has 42 references indexed in Scilit:
- Evolutionary models for low-mass stars and brown dwarfs: Uncertainties and limits at very young agesAstronomy & Astrophysics, 2002
- Precipitating Condensation Clouds in Substellar AtmospheresThe Astrophysical Journal, 2001
- Irradiated PlanetsThe Astrophysical Journal, 2001
- The Limiting Effects of Dust in Brown Dwarf Model AtmospheresThe Astrophysical Journal, 2001
- On the Tidal Inflation of Short‐Period Extrasolar PlanetsThe Astrophysical Journal, 2001
- The Near‐Infrared and Optical Spectra of Methane Dwarfs and Brown DwarfsThe Astrophysical Journal, 2000
- A Nongray Theory of Extrasolar Giant Planets and Brown DwarfsThe Astrophysical Journal, 1997
- MODEL ATMOSPHERES OF VERY LOW MASS STARS AND BROWN DWARFSAnnual Review of Astronomy and Astrophysics, 1997
- Synthetic Spectra and Mass Determination of the Brown Dwarf Gliese 229BThe Astrophysical Journal, 1996
- A model atmosphere investigation of the effects of irradiation on the secondary star in a dwarf novaMonthly Notices of the Royal Astronomical Society, 1993